![]() However, it’s possible to transcode them in such a way that it’s not perceptible to most viewers: $ ffmpeg -i media.mkv -c:v libx264 -crf 18 -c:a aac -b:a 128k -strict experimental media.mp4 In the case of the audio and video streams, we might need to transcode them into MP4-supported formats like H.264 and AAC. Next, we can embed the subtitle in the final MP4 output. srt from the MKV container and convert this to an MP4-supported format like TTML and WebVTT. For instance, in the case of subtitles, we should first extract the. So, before conversion, we should first understand the formats that are supported by our target container. For instance, MP4 doesn’t natively support SubRip (. However, it’s not true for MP4 containers. Stream SelectionĪs we know, MKV supports a wide variety of codecs and file formats. However, there are a few caveats, which we’ll go over next. Moreover, this method should work most of the time. Here, we can observe that the file size and bit rate remain the same, which implies that video stream quality is more or less the same. Let’s take a look at the output detail: $ mediainfo -Inform="General" media.mp4 Conversely, we can specify individual codecs with -c:a and -c:v for video and audio, respectively. In addition, the -codec encapsulates both the audio and video codecs. As a result, it makes the process faster because there is no re-encoding to carry out. ![]() -codec specifies the codec to use, which is copy in this caseĪptly, the copy option copies or “remuxes” the codecs inside the original container to the output container. ![]()
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